Detcon DM-600IS - Manual (Page 33)

DM-600IS
DM-600IS Instruction Manual Rev 1.5.9 Page 29 of 37
12.0 PROGRAM FEATURES
Detcon MicroSafeTM toxic gas sensors incorporate a comprehensive program to accommodate easy operator
interface and fail-safe operation. Program features are detailed in this section. Each sensor is factory tested,
programmed, and calibrated prior to shipment.
Over Range
When the sensor detects gas greater than 100% of range, it will cause the display to flash the highest reading
of its range on and off.
Under Range Fault(s)
If the sensor should drift below a zero baseline of -10% of range, the display will indicate a fault: “ZERO
FAULT”. This is typically fixed by performing another zero cal. When the total negative zero drift exceeds
the acceptable threshold the display will indicate “SENSOR FAULT” and you will longer be able to zero
calibrate.
Span Fault #1
If during span calibration the sensor circuitry is unable to attain a minimum defined response to span gas, the
sensor will enter into the calibration fault mode and cause the display to alternate between the sensor’s current
status reading and the calibration fault screen which appears as: “SPAN FAULT #1”. The previous calibration
settings will remain saved in memory. Previous span calibration is retained.
Span Fault #2
If during the span routine, the sensor circuitry is unable to attain a minimum defined stabilization point, the
sensor will enter into the calibration fault mode and cause the display to alternate between the sensor’s current
status reading and the calibration fault screen which appears as “SPAN FAULT #2”. Previous span calibration
is retained.
Memory Fault
If new data points cannot successfully be stored to memory the display will indicate: “MEMORY FAULT”.
Fail-Safe/Fault Supervision
Detcon MicroSafeTM sensors are programmed for fail-safe operation. All fault conditions illuminate the fault
LED, and cause the display to read its corresponding fault condition: “ZERO FAULT”, “SENSOR FAULT”,
“SPAN FAULT #1”, or “SPAN FAULT #2”. A “SENSOR FAULT” and “ZERO FAULT” will activate the
fault relay and cause the mA output to drop to zero (0) mA.
Sensor Life
The “Sensor Life” feature gauges the remaining sensor life based on signal output from the sensor cell. When
sensor life of 25% or less remains the sensor cell should be replaced within a reasonable maintenance
schedule.
13.0 UNIVERSAL TRANSMITTER FEATURE (RE-
INITIALIZATION)
The Model DM600IS uses a universal transmitter design that allows the transmitter to be set up for any target
gas and any toxic concentration range. The original transmitter set-up is done at Detcon Inc. as part of the
sensor test and calibration procedure, but it may also be changed in the field if necessary. The Universal
Transmitter feature is a significant convenience to the user because it allows hardware flexibility and
minimizes the spare parts requirements to handle unexpected transmitter failures of different gas/ranges. It is